In the following viewpoint, “It may be hardly noticeable to most of us, but the world’s temperature is rising. How far and how fast it will rise, no one can yet predict” (Ben Bova, p. 26). Ben Bova claims that the earth becomes global warming being real, but we cannot feel an evident effect. About the twentieth century, scientists found that global warming made the temperature change higher and higher as time goes on. Close to the twenty-one century, researchers researched how the global warming produced. In early the twenty-one century, scientists could be able to foresee that global warming made the sea level rise, but now they are still estimating how the global warming brings to a great harm. Does global warming is a big problem? Some
